/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.rest.service.api.history;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;
import io.swagger.annotations.ApiResponse;
import io.swagger.annotations.ApiResponses;
import io.swagger.annotations.Authorization;

import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.activiti.engine.HistoryService;
import org.activiti.engine.history.HistoricIdentityLink;
import org.activiti.rest.service.api.RestResponseFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author Tijs Rademakers
 */
@RestController
@Api(tags = { "History" }, description = "Manage History", authorizations = { @Authorization(value = "basicAuth") })
public class HistoricTaskInstanceIdentityLinkCollectionResource {

  @Autowired
  protected RestResponseFactory restResponseFactory;

  @Autowired
  protected HistoryService historyService;

  @ApiOperation(value = "Get the identity links of a historic task instance", tags = { "History" }, notes = "")
  @ApiResponses(value = {
      @ApiResponse(code = 200, message = "Indicates request was successful and the identity links are returned", response = HistoricIdentityLinkResponse.class, responseContainer="List"),
      @ApiResponse(code = 404, message = "Indicates the task instance could not be found.") })
  @RequestMapping(value = "/history/historic-task-instances/{taskId}/identitylinks", method = RequestMethod.GET, produces = "application/json")
  public List<HistoricIdentityLinkResponse> getTaskIdentityLinks(@ApiParam(name="taskId") @PathVariable String taskId, HttpServletRequest request) {
    List<HistoricIdentityLink> identityLinks = historyService.getHistoricIdentityLinksForTask(taskId);

    if (identityLinks != null) {
      return restResponseFactory.createHistoricIdentityLinkResponseList(identityLinks);
    }

    return new ArrayList<HistoricIdentityLinkResponse>();
  }
}
